Reflector



A. G. FRANCE.

REFLECTOR. APPLICATION HLED MAY 17, I920.

1941956, Patented June 6, 1922.

2 SHEETSSHEET l- A. G. FRANCE.

REFLECTOR.

APPLICATION FILED MAY I7. I920.

2 $HEETSSHEET 2.

1,418,556. PatentedJunev 6, 1922.

ARTHUR GRAHAM FRANCE, OF LONDON, ENGLAND.

REFLECTOR.

Specification of Letters Patent.

Patented June 6, 1922.

Application filed May 17, 1920. Serial No. 382,077.

(GRANTED UNDER, THE PROVISIONS OF THE ACT OF MARCH 3, 1921, 41 STAT. L, 1313.)

To all who-m it may comer r1:

Be it hereby known that I, ARTHUR GRA- HAM FRANoE, a subject of the King of Great Britain, and residing at 64 Chancery Lane, London, \V. C., England, have invented certain new and useful Improvements in or Relating to Reflectors (for which I' have filed application for patent in England,

' and relatingto means #105,600. dated April 16. 1917, under Se rial #5,5 67), of which the following is a specification.

This invention comprises improvements in for concentrating or intensifying the light of electric filament lamps.

The present invention relates to reflectors for use with electric filament lamps in order to intensify the light emitted thereby, the main object of the said invention being to intensify the said light to a greater degree than possible with reflectors as heretofore made and used.

According to the said invention the effective surface of an opaque reflector or shade is dull. and of a lustrous, sheeny, glossy or silky character in appearance instead of being bright polished or highly brilliant and perfectly smooth as heretofore. The reflector is opaque and the surface to which I refer as lustrous, or sheeny, in character is such as is produced for example by dull silver plating sheet metal after it has been sand blasted. The said dull,.and lustrous, sheeny, glossy or silky surface is of a pearly colour that is a light bluish grey approximating to the colour of pearls and its glossiness is preferably about equal to that of pearls.

This improved reflector is preferably arranged to be placed upon the lamp as close as possible to the filament of same and in a position in which the hole of the reflector in depth corresponds with the total length of the filament. In other words the annular reflector or shade is so arranged that the rays of light emitted by the filament laterally in-relation to the longitudinal axis of the lamp meet the effective surface of the reflector or shade in the shortest possible range whereby the reflector or shade concentrates or intensifies all the more effective rays of light emitted by the filament in a direction or directions approximately in line with or parallel to the longitudinal axis of lustrous or silky appearance.

the lamp, whereas if the reflectors or shades are combined with electric filament lamps in the ordinary way mounted at the base of the lamp the position of the reflector or shade has been such that many of the rays of light emitted by the filament have not reached the reflector or shade or have only reached the same after they have been diffused or dissipated to some extent.

In order that the invention may be thoroughly understood and easily carried into Figure 3 is a section. on line 3-3 of.

Fig. 2.

Figure 4 is a similar view to Fig. 1, showing a modification of the electric bulb to re-- ceive the reflector.

Figure 5 is a sectional view of the reflector showing a slight modification.

The surface of the opaque shade or reflector a is dull and of a lustrous, sheeny or silky character and of a pearly or light bluish. grey colour similar to the colour of pearls and the glossiness of the surface approximates to that of pearls.

Reflecting surfaces of the preferred charcter aforesaid are very conveniently produced by dull plating sheet metal, as for instance zinc with silver on that part of the metal body of the reflector which is to constitute the reflecting surface but leaving such deposit unpolished. A particularly eflicient reflecting surface according to the present mvention is produced by dull silver plating sheet metal after it has been directly treated by sand blast or after it has been first dull silver plated and then treated by sand blast. Or a dull pearly lustrous reflecting surface may be produced by coating bright tin-plate with an ordinary metal lacquer which While almost transparent when in a thin film has just sufficient .opaqueness when brushed over a tin plate surface to dull the usual highly brilliant surface thereof and give it a dull pearly lustrous reflecting surface may be produced by comparatively small spheres or Or a dull heads of vitreous material of a pearly colour attached to 'or secured on a foundation or the body of the reflector.

The term dull plating as used in the specification means that the article is left inv the condition in which it leaves the plating bath and is not polished or burnished.

The drawings show the reflector a in the preferred relation to the lamp 1). As shown at Fig. 1, the reflector a or shade isof a.

depth corresponding at least with the depth of the filament or element of the lamp, so that the whole of the filament is laterally on a level with the reflector and the latter is as close as possible to the filament. For this purpose one surrounding edge of the reflector a surrounds the bulb b on a level with one end of the filament and the other surrounding edge surrounds the bulb on a level with the other edge" of the filament. When the light is to be directed downward the smaller aperture 0 of the-reflector surrounds the lamp, and the edge is in close proximity thereto, level with the part 03 of the fila-' ment nearest the base 6 of the lamp and the outer edge 7 of the reflector is substantially on a level withthe part 9 of the filament furthest from the base 6 of the lamp.

v It may be desirable to form, the reflector a so that it may be adjustable'as to the size of its central aperture 0 whereby the same reflector or shade may be used in the proper position according to this invention with bulbs of difl'erent size or shape within ordinarylimits, but no claim is made to such an adjustable reflector per se. In one example of this adjustable reflector or shade shown at Figs. 2 and 3 it is made withoverlapping parts each provided with bent over lugs such as h and j respectively frictionally engaging over the other overlapping part. By

' this means the extent of overlap and the size -.of the aperture 0 may be adjusted by sliding the overlapping parts relatively to each other, and the friction between the parts and the engaging lugs retains the parts in ad= justed positions.

or there may bea series of projections around it, at the part where the part of the reflector or shade ,of smallest diameter should be in juxtaposition to the lamp bulb As shown at 4 the bulb b of the lamp" is provided with an annular projection la.

so that the said projection 10- or projections constitutes or constitute permanent provi sion for supporting the reflector or shade in f the proper position accordingto the present the reflector or shade being attached to and supported from the base of thelamp or its holder.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be per-= fo'rmed I declare that what I claim is In combination with an electric filament lamp, an opaque reflecting member arranged laterally on a level with the lighting source,

and having its upper edge arranged closely around the lighting source, said reflecting member being of hollow truncated conoidal form, and having a matte lustrous surface formed by dull plating the surface after sandblasting the same.

In testimony whereof I afiix my signature.

ARTHUR GRAHAM FRANCE. 

